Three people have been arrested after another drug investigation was conducted in Oshawa. Yesterday a search warrant was executed on Dalhousie Crescent, resulting in the seizure of 21 grams of cocaine, nearly eight grams of ecstasy, and close to five pounds of marijuana. The drugs were valued at about $15,000, and about $4000 in cash was also seized. The suspects, all in their mid-20's, were residents of the house. They have been held for a bail hearing.